/*
 * Copyright 2010 Christoph Widulle (christoph.widulle@googlemail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */



package com.android1.amarena2d.commons.collections;

import com.android1.amarena2d.engine.AmarenaEngine;
import com.android1.amarena2d.exceptions.ResourceExceededException;

public abstract class FixedSizePool<T> {

    private FixedSizeStack<T> pool;

    private static final int DEFAULT_SIZE = 32;

    public FixedSizePool() {
        super();
        setSize(DEFAULT_SIZE);
    }

    public FixedSizePool(int size) {
        super();
        setSize(size);
    }

    public T acquire() {
        T result = pool.pop();
        if (result == null && AmarenaEngine.DEBUG)
            AmarenaEngine.engine.log("FixedSizePool", "Object pool of type " + this.getClass().getSimpleName() + " exhausted.");
        return result;
    }

    public void release(T entry) {
        if (!pool.contains(entry))
            pool.push(entry);
    }

    private void setSize(int size) {
        pool = new FixedSizeStack<T>(size);

        for (int i = 0; i < size; i++) {
            pool.push(newElement());
        }
    }

    protected abstract T newElement();

}
